From bced35b65aefe53a6f77a9ed0ce1aea86e9d65a2 Mon Sep 17 00:00:00 2001
From: Andy Lutomirski <luto@amacapital.net>
Date: Wed, 19 Nov 2014 17:59:41 -0800
Subject: [PATCH] x86, traps: Add ist_begin_non_atomic and ist_end_non_atomic

In some IST handlers, if the interrupt came from user mode,
we can safely enable preemption.  Add helpers to do it safely.

This is intended to be used my the memory failure code in
do_machine_check.

Acked-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
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